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1. [Amps] pi filter QBL 5/3500 (score: 1): Author: "PE1E" <PE1E@chello.nl>; Date: Mon, 6 Nov 2006 13:16:13 +0100; 1. If I build a plate output pi filter ( > Cin 5-300 pf 25Kv var.vacuum > tapped coil .3 " copper pipe > Cout 15-1000 pf 5 Kv var.vacuum ) for my QBL 5/.3500 HF amp ( Va 6 Kv , Ia 1.1 A ) in statu na; /archives//html/Amps/2006-11/msg00084.html (7,227 bytes)
2. Re: [Amps] pi filter QBL 5/3500 (score: 1): Author: "Robert B. Bonner" <rbonner@qro.com>; Date: Mon, 6 Nov 2006 13:19:45 -0600; Maybe I'm missing something here. I didn't take the time to calculate your actual plate impedance. It will be high, which will lower the C requirements. Even said with my experience, that 300 pf tune; /archives//html/Amps/2006-11/msg00089.html (9,676 bytes)
3. Re: [Amps] pi filter QBL 5/3500 (score: 1): Author: "Peter Voelpel" <df3kv@t-online.de>; Date: Mon, 6 Nov 2006 20:38:10 +0100; Hi Bob, His output impedance will be slightly above 3 kohms. So 300pf are plenty on 80m, also on 160m when his Q is not higher then 10 it will be fine as strays add to it. But with high impedance a h; /archives//html/Amps/2006-11/msg00091.html (10,265 bytes)
4. Re: [Amps] pi filter QBL 5/3500 (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 6 Nov 2006 15:03:55 -0500; Strays nomally subtract from the effective capacitance on 160. They add on higher bands, but the shunt reactance of the choke dominatates on 160 and 80 reducing effective capacitance....not that a Q; /archives//html/Amps/2006-11/msg00093.html (8,114 bytes)
5. Re: [Amps] pi filter QBL 5/3500 (score: 1): Author: "PE1E" <PE1E@chello.nl>; Date: Tue, 7 Nov 2006 14:22:40 +0100; Thanks to the various respondents ! This did help. I therefore now renounce the roller inductor and will use instead .3" wide spaced copper pipe, tapped on the 80-10 bands plus a 160 mtr switchable e; /archives//html/Amps/2006-11/msg00101.html (8,019 bytes)
6. Re: [Amps] pi filter QBL 5/3500 (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 7 Nov 2006 08:53:06 -0500; Peter, People sometimes promise anything when selling an idea. The fact is there is NOTHING about the G2DAF system that helps IM distortion. It does not help linearity, it generally makes it worse.; /archives//html/Amps/2006-11/msg00102.html (9,842 bytes)
7. Re: [Amps] pi filter QBL 5/3500 (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Tue, 7 Nov 2006 15:06:11 +0100 (CET); The linearity of the G2DAF was questioned by a professional valve design and applications engineer (the late G6JP) shortly after the circuit was first published some 40 years ago. Subsequent events h; /archives//html/Amps/2006-11/msg00103.html (7,640 bytes)
8. Re: [Amps] pi filter QBL 5/3500 (score: 1): Author: Ian White GM3SEK <gm3sek@ifwtech.co.uk>; Date: Tue, 7 Nov 2006 23:46:37 +0000; The original G2DAF articles are archived on my website, should anyone wish to read them. G2DAF's own 2x 4-125 amplifier was left to the RSGB Museum. By the end of his life, the screen rectifiers had; /archives//html/Amps/2006-11/msg00115.html (7,887 bytes)
9. Re: [Amps] pi filter QBL 5/3500 (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 7 Nov 2006 19:10:56 -0500; There isn't much to figure. He probably just settled on the best circuit. 73 Tom _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mai; /archives//html/Amps/2006-11/msg00116.html (7,994 bytes)

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